Implantable brain–computer interface technology is an expanding area of engineering research now moving into clinical application. Ensuring meaningful informed consent in implantable BCI research is an ethical imperative. The emerging and rapidly evolving nature of implantable BCI research makes identification of risks, a critical component of informed consent, a challenge. In this paper, 6 core risk domains relevant to implantable BCI research are identified—short and long term safety, cognitive and communicative impairment, inappropriate expectations, involuntariness, affective impairment, and privacy and security. (...) Work in deep brain stimulation provides a useful starting point for understanding this core set of risks in implantable BCI. Three further risk domains—risks pertaining to identity, agency, and stigma—are identified. These risks are not typically part of formalized consent processes. It is important as informed consent practices are further developed for implantable BCI research that attention be paid not just to disclosing core research risks but exploring the meaning of BCI research with potential participants. (shrink)

Voluntariness of consent to research has not been sufficiently explored through empirical research. The aims of this study were to develop a more comprehensive approach to assessing voluntariness and to generate preliminary data on the extent and correlates of limitations on voluntariness. We developed a questionnaire to evaluate subjects’ reported motivations and constraints on voluntariness. 88 subjects in five different areas of clinical research—substance abuse, cancer, HIV, interventional cardiology, and depression—were assessed. Subjects reported a variety of motivations for participation. Offers (...) of financial incentives were common but not influential, pressures from others were rare, and no threats were reported. However, certain financial incentives and—paradoxically—altruistic motivations led some subjects to feel more constrained. Consistent with previous studies, no one pattern of motivation was common to all research subjects. There was little evidence of constrained voluntariness, but some suggestion of areas of concern. Voluntariness appears to be susceptible to systematic empirical investigation. (shrink)